public boolean isInZoomCenter(Point p) {
   Point p_intern = model.getModelGrafic().transformToIntern(this.viewId, p);
   Point center_intern = model.getModelGrafic().transformToIntern(this.viewId, point);
   // System.out.println("Marker: p     : "+p_intern);
   // System.out.println("Marker: center: "+center_intern);
   int dx = p_intern.x - center_intern.x;
   int dy = p_intern.y - center_intern.y;
   return Math.sqrt(dx * dx + dy * dy) <= 10;
 }
 public void paintComponent(Graphics g) {
   // System.out.println("ZoomMarker.paint");
   Graphics2D g2 = (Graphics2D) g;
   if (this.point != null) {
     Point intern = model.getModelGrafic().transformToIntern(this.viewId, point);
     g2.setColor(Grafic.COLOR_ZOOM_MARKER);
     g2.setStroke(new BasicStroke(1));
     if (this.shift_mode) g2.fillOval(intern.x - 10, intern.y - 10, 20, 20);
     else g2.drawOval(intern.x - 10, intern.y - 10, 20, 20);
     g2.drawLine(intern.x - 20, intern.y, intern.x + 20, intern.y);
     g2.drawLine(intern.x, intern.y - 20, intern.x, intern.y + 20);
   }
 }